wpwrak: for CC2543 how do you begin in determining what components to connect to which pin when you start designing this ? do you go through and read everything that is in the datasheet ? or there is something like a reference template that is provided by the chip vendor

I was thinking if we want to start designing something with a new chip reading through datasheet for someone like me is going to be a nightmare as surely I won't be able to understand all the detail technical specs that is listed inside the datasheet so interested to know what are the normal steps that you take

wpwrak: another question...looking through CC2543 datasheet pg 21 under the 'Application Information' section pin 18 is connect to GND while y-box is to 3v3 ... and pin 23 and 24 connect to 3v3 with 220pF and 100nF while datasheet connect pin 23,24 and 29 straight to power (2-3.6v) ?

nicksydney: (selecting cc2543 pins) well, first i have a look at what functions are in the chip. then i select the ones i need. e.g., UART in SPI mode for SPI and a timer output for the clock that goes to the KL25

"order of signals" = if chip 1 needs to talk to chip 2 and chip 1 has the signals A B C D in this fixed order but i can configure different orders for chip 2, then i should try to find something close to A B C D as well

the values in the tuning/matching circuit depend on lots of hard to calculate factors. sometimes you don't need anything. so it's all trial and error. for the prototype, i don't plan on making a lot of RF optimization experiments. but i include space for the components in the circuit, so that it can be tuned if needed.

DocScrutinizer05: was thinking if we strip off all the unneeded features of Neo900 it can be used something like the cloudphone project...probably add some other stuff like heart-rate sensors, temp sensor :)